Bonus Real-World Floor Guide
Comprehensive Metabolic Panel — CMP
Heartbeat Humor Academy — Come laugh, learn, heal, repeat.
The CMP contains 14 common chemistry tests covering electrolytes,
kidney function, glucose/calcium, liver/biliary function, and
proteins.
Range rule: These are common adult NCLEX-style study
ranges. Laboratory methods, age, pregnancy, and clinical context may
change the reference interval. Use the range printed on the client’s
report.
CMP Quick Range Table
| Test |
Common Adult/NCLEX Range |
| Sodium |
135–145 mEq/L |
| Potassium |
3.5–5.0 mEq/L |
| Chloride |
98–106 mEq/L |
| CO₂/bicarbonate |
22–29 mEq/L |
| BUN |
10–20 mg/dL; some labs 6–20 |
| Creatinine |
0.6–1.2 mg/dL |
| Glucose, fasting |
70–99 mg/dL |
| Total calcium |
8.5–10.5 mg/dL |
| AST |
10–40 U/L |
| ALT |
7–56 U/L |
| Alkaline phosphatase |
44–147 U/L |
| Total bilirubin |
0.1–1.2 mg/dL |
| Albumin |
3.5–5.0 g/dL |
| Total protein |
6.0–8.3 g/dL |
Electrolytes & Acid–Base
Sodium — Na⁺
Normal range: 135–145 mEq/L
The Nursing Shift: High commonly reflects water
deficit and may cause thirst, restlessness, confusion, twitching, or
seizures. Low may reflect excess water, sodium loss, SIADH, heart
failure, GI loss, or medications and may cause headache, confusion,
decreased consciousness, or seizures.
Pharma Safety Connection: Loop/thiazide diuretics,
SSRIs/SNRIs, carbamazepine, and oxcarbazepine may lower sodium.
Dehydration or sodium loss can raise lithium levels. With a major
acute abnormality or neurological symptoms, hold the questionable
medication, institute seizure/airway precautions as needed, and
escalate. Sodium correction must follow a prescribed controlled
plan.
Potassium — K⁺
Normal range: 3.5–5.0 mEq/L
The Nursing Shift: High potassium can cause
weakness, bradycardia, peaked T waves, QRS widening, and lethal
dysrhythmias. Low potassium can cause weakness, cramps,
ileus/constipation, flattened T waves, U waves, and dysrhythmias.
Pharma Safety Connection: ACE inhibitors, ARBs,
spironolactone, trimethoprim, and supplements may raise K.
Loop/thiazide diuretics, GI losses, and laxative misuse may lower K.
Low K increases digoxin toxicity risk. Question potassium-wasting or
potassium-raising drugs when the value is outside the prescribed
parameter. Never give IV potassium by direct IV push.
Chloride — Cl⁻
Normal range: 98–106 mEq/L
The Nursing Shift: High may occur with dehydration,
hyperchloremic metabolic acidosis, or heavy normal-saline exposure.
Low may occur with vomiting, gastric suction, diuretics, or
metabolic alkalosis.
Pharma Safety Connection: Review diuretics, IV
fluids, bicarbonate therapy, GI losses, sodium, and CO₂. Chloride
alone rarely determines a medication hold; interpret the full fluid
and acid–base picture.
CO₂ / Serum Bicarbonate
Normal range: 22–29 mEq/L
The Nursing Shift: High often suggests metabolic
alkalosis or compensation for chronic respiratory acidosis. Low
often suggests metabolic acidosis from DKA, kidney failure,
diarrhea, sepsis, or lactic acidosis.
Pharma Safety Connection: Low CO₂ with rapid
breathing, hypotension, confusion, acute kidney injury, or metformin
use requires urgent acidosis evaluation. Diuretics may contribute to
alkalosis; acetazolamide lowers bicarbonate. Follow drug-specific
and renal protocols.
Kidney Function
Blood Urea Nitrogen — BUN
Normal range: 10–20 mg/dL; many labs use 6–20
mg/dL.
The Nursing Shift: High can reflect dehydration,
reduced renal perfusion/function, GI bleeding, or increased protein
breakdown. Low can reflect liver dysfunction, malnutrition,
pregnancy, or overhydration.
Pharma Safety Connection: Trend BUN with
creatinine, eGFR, urine output, BP, and hydration. Diuretics,
ACEI/ARBs, and NSAIDs can affect renal perfusion. BUN alone is not a
universal reason to hold a medication.
Serum Creatinine
Normal range: 0.6–1.2 mg/dL
The Nursing Shift: A high or rising level suggests
reduced filtration, AKI, CKD, obstruction, dehydration, or
nephrotoxicity. A low level often reflects low muscle mass and does
not guarantee strong renal function.
Pharma Safety Connection: Review eGFR/CrCl—not
creatinine alone—for digoxin, lithium, aminoglycosides, vancomycin,
metformin, gabapentin, enoxaparin, and many others. Rapidly rising
creatinine, oliguria, or toxicity symptoms require pausing and
clarifying renally cleared/nephrotoxic drugs.
Glucose & Calcium
Glucose
Normal fasting range: 70–99 mg/dL
The Nursing Shift: High may result from diabetes,
infection, stress, steroids, or missed therapy. Low—below 70
mg/dL—is hypoglycemia and may cause sweating, tremor, confusion,
behavior change, seizure, or coma.
Pharma Safety Connection: Check glucose and meal
availability before prandial insulin. Treat hypoglycemia under
protocol and clarify glucose-lowering medication. Steroids and some
antipsychotics can raise glucose; beta blockers may mask adrenergic
warning signs.
Total Calcium
Normal range: 8.5–10.5 mg/dL
The Nursing Shift: High may cause weakness,
constipation, stones, confusion, and dysrhythmias. Low may cause
perioral tingling, cramps, tetany, prolonged QT, seizure, or
laryngospasm.
Pharma Safety Connection: Thiazides may raise
calcium; loops and bisphosphonates may lower it. Hypercalcemia can
increase digoxin-associated dysrhythmia risk. Check albumin or
ionized calcium when total calcium is difficult to interpret.
Symptomatic extremes require urgent evaluation.
Liver & Biliary Function
AST
Normal range: 10–40 U/L
The Nursing Shift: High can reflect liver injury
but can also arise from muscle or cardiac injury. Low is usually not
clinically significant.
Pharma Safety Connection: Trend with ALT,
bilirubin, symptoms, and the drug label for acetaminophen, statins,
valproate, tuberculosis drugs, methotrexate, and selected
anti-infectives. No single AST value is a universal hold rule.
ALT
Normal range: 7–56 U/L
The Nursing Shift: High more specifically suggests
hepatocellular injury; low is usually not concerning.
Pharma Safety Connection: New jaundice, RUQ pain,
dark urine, persistent vomiting, or major enzyme rise during a
hepatotoxic drug requires holding/clarifying under the
medication-specific protocol. Count acetaminophen from every
combination product.
Alkaline Phosphatase — ALP
Normal range: 44–147 U/L
The Nursing Shift: High may indicate biliary
obstruction/cholestasis or bone activity. Low may occur with
malnutrition, zinc deficiency, or hypothyroidism.
Pharma Safety Connection: High ALP plus bilirubin,
itching, jaundice, dark urine, or pale stools requires review for
cholestasis and medication-related injury. Interpret with AST/ALT
and clinical context.
Total Bilirubin
Normal range: 0.1–1.2 mg/dL
The Nursing Shift: High can reflect hemolysis,
impaired liver processing, or bile obstruction and may cause
jaundice, dark urine, pale stool, or itching. Low is usually not
significant.
Pharma Safety Connection: New jaundice during
potentially hepatotoxic therapy warrants prompt review before
another dose. Assess liver injury, obstruction, and hemolysis rather
than assuming one cause.
Protein & Nutrition
Albumin
Normal range: 3.5–5.0 g/dL
The Nursing Shift: High usually indicates
dehydration. Low may reflect liver dysfunction, inflammation,
malnutrition, burns, or renal protein loss and may cause edema.
Pharma Safety Connection: Low albumin can increase
free active phenytoin, valproate, and warfarin. Review free drug
levels or corrected interpretation when appropriate; do not increase
a dose solely from a low total level.
Total Protein
Normal range: 6.0–8.3 g/dL
The Nursing Shift: High may reflect dehydration,
inflammation, or abnormal proteins. Low may reflect malnutrition,
liver disease, malabsorption, or renal protein loss.
Pharma Safety Connection: Use total protein as
context for nutrition and binding, but albumin is usually more
actionable. Do not hold a drug from total protein alone.
CMP red flags: ECG changes with K abnormality;
seizure/confusion with acute Na abnormality; glucose below 70 with
symptoms; rapidly rising creatinine with oliguria; severe acidosis
pattern; or jaundice/systemic symptoms during hepatotoxic therapy.
Bonus Real-World Floor Guide
Complete Blood Count — CBC
Heartbeat Humor Academy — Come laugh, learn, heal, repeat.
CBC Quick Range Table
| Test |
Common Adult/NCLEX Range |
| WBC |
4,500–11,000 cells/mm³ |
| Hemoglobin, female |
12–16 g/dL |
| Hemoglobin, male |
13–18 g/dL |
| Hematocrit, female |
36%–48% |
| Hematocrit, male |
40%–55% |
| Platelets |
150,000–400,000/mm³ |
White Blood Cells — WBC
Normal range: 4,500–11,000 cells/mm³
The Nursing Shift: High may suggest infection,
inflammation, stress, corticosteroid effect, or hematologic disease.
Low may suggest marrow suppression, chemotherapy,
immunosuppressants, severe infection, or disease.
Pharma Safety Connection: Review CBC with
differential and ANC before chemotherapy, clozapine, antithyroid
drugs, and marrow-suppressing immunosuppressants when ordered. Do
not use WBC alone to judge infection risk. Fever with neutropenia is
an emergency.
ANC companion: ANC = WBC × (% neutrophils + % bands)
÷ 100. ANC below 500 cells/mm³ means high infection risk. Follow the
oncology program’s fever threshold; 100.4°F/38°C commonly triggers
urgent evaluation.
Hemoglobin — Hgb
Normal range: Female 12–16 g/dL; male 13–18 g/dL.
The Nursing Shift: High commonly reflects
hemoconcentration/chronic hypoxia. Low indicates anemia, blood loss,
marrow suppression, kidney disease, nutrition deficiency, or
hemolysis and may cause fatigue, dyspnea, tachycardia, pallor,
dizziness, or chest pain.
Pharma Safety Connection: A falling Hgb in a client
on warfarin, heparin, a DOAC, or antiplatelet therapy may be occult
bleeding. Chemotherapy and immunosuppressants may suppress
production. A rapid fall with hypotension, tachycardia, melena,
hematemesis, flank pain, or neuro change requires holding/clarifying
anticoagulation and urgent evaluation. There is no universal
transfusion threshold for every client.
Hematocrit — Hct
Normal range: Female 36%–48%; male 40%–55%.
The Nursing Shift: High often reflects dehydration
or polycythemia. Low may reflect anemia, bleeding, overhydration, or
marrow suppression.
Pharma Safety Connection: Trend with Hgb and
hydration. An unexpected fall during anticoagulation may signal GI,
retroperitoneal, surgical, or intracranial bleeding. Assess the
client before assuming dilution or chronic anemia.
Platelets — Plt
Normal range: 150,000–400,000/mm³
The Nursing Shift: High may increase clot risk in
some conditions. Low increases bleeding risk; below approximately
50,000/mm³, ordinary activity can produce more bleeding, although
risk depends on cause and function.
Pharma Safety Connection: Chemotherapy,
immunosuppressants, sepsis, and immune reactions can lower
platelets. Anticoagulants increase bleeding consequences. Suspect
HIT when platelets fall roughly 50% after heparin exposure, even if
the count remains above 150,000. Stop all heparin products under the
HIT protocol and notify. Use regimen-specific chemotherapy hold
thresholds.
CBC red flags: neutropenic fever; rapid Hgb/Hct fall;
active bleeding; platelet fall around 50% with heparin; severe
headache or neurological change; or pancytopenia during
marrow-suppressing therapy.
Bonus Real-World Floor Guide
Coagulation Profile Study Sheet
Heartbeat Humor Academy — Come laugh, learn, heal, repeat.
Plain-language reminder: Nurses may say blood is “too thick” or
“too thin.” Anticoagulants do not literally change thickness; these
phrases describe clotting too quickly or too slowly.
PT / INR — Warfarin
Normal vs Therapeutic
| Status |
PT |
INR |
| Not taking anticoagulant |
11–13.5 sec |
0.8–1.1 |
| Taking warfarin |
Use standardized INR |
Often 2.0–3.0; some valves/conditions use another prescribed
target
|
The Nursing Shift: INR below the prescribed target
means clotting may be faster than desired and thromboembolism risk
may remain. INR above the target means clotting is slower and
bleeding risk rises. Symptoms and trend determine urgency.
Pharma Safety Connection: Before warfarin, verify
INR target/hold order, bleeding assessment, CBC/platelets,
falls/procedures, new illness, antibiotics, supplements, and diet
changes. A high INR without bleeding generally prompts
holding/adjusting under protocol; high INR with major bleeding is an
emergency.
Warfarin Maintenance Rules
- Take at the same time daily; never double a missed dose.
-
Keep vitamin K intake consistent—do not eliminate all leafy greens.
-
Report antibiotics, antifungals, NSAIDs/aspirin, amiodarone, alcohol
changes, and herbal products.
-
Report red/brown urine, black stool, hematemesis, uncontrolled
bleeding, severe headache, or any head injury.
- Keep all INR appointments.
Warfarin reversal: Vitamin K (phytonadione). For
acute major/life-threatening bleeding, stop warfarin and expect IV
vitamin K plus 4-factor prothrombin complex concentrate under
emergency orders; plasma may be used when PCC is
unavailable/unsuitable. Support ABCs and control the bleeding source.
aPTT — Continuous IV Unfractionated Heparin
Normal vs Therapeutic
| Status |
aPTT |
| Not taking heparin |
25–35 sec |
| Continuous IV heparin |
Often 1.5–2.5 times control; many facilities use a
lab-specific aPTT or anti-Xa nomogram
|
The Nursing Shift: Below target may mean inadequate
anticoagulation or an interrupted/wrong infusion. Above target may
mean excessive heparin effect, sample contamination, or another
coagulation disorder. Active bleeding, instability, or neurological
change makes the result emergent.
Pharma Safety Connection: Verify baseline
CBC/platelets/Hgb/Hct, coagulation test, weight in kg,
concentration, units/kg/hr, pump rate, line attachment, and next
draw time. Use the smart-pump library and a facility-required
independent check. Draw aPTT/anti-Xa at the ordered time—commonly
around six hours after initiation or a rate change until
therapeutic.
If aPTT Is Critically High
-
Stop the heparin infusion when directed by the emergency
protocol/nomogram—immediately when active bleeding or instability is
present.
-
Assess ABCs, vitals, neuro status, IV sites, urine, stool,
abdomen/flank/back, and Hgb/Hct trend.
- Notify and follow the critical-value process.
-
Verify pump rate, bag concentration, line, and recent heparin
amount.
- Obtain repeat tests and prepare reversal as ordered.
- Do not restart until the nomogram/prescriber directs it.
Heparin reversal: Protamine sulfate. Approximately 1
mg neutralizes about 100 units of recently administered unfractionated
heparin; the need falls over time. The heparin label limits
administration to no more than 50 mg very slowly in any 10-minute
period. Dose calculation belongs to the prescriber/pharmacist and
current protocol. Monitor for severe hypotension, bradycardia,
pulmonary hypertension, or anaphylactoid reaction.
HIT Guardrail
Suspect heparin-induced thrombocytopenia when platelets fall about 50%
from baseline or a new clot develops after heparin exposure. Stop all
heparin—including flushes—under protocol, notify, and expect a
non-heparin anticoagulant evaluation.
| Drug |
Test |
Main Emergency |
Reversal |
| Warfarin |
PT/INR |
Major bleeding |
Vitamin K + 4F-PCC when ordered for major bleed |
| IV unfractionated heparin |
aPTT or anti-Xa |
Major bleeding/HIT |
Protamine for bleeding; stop all heparin for HIT |
Coagulation Quiz
High aPTT Priority
A client receiving IV heparin for pulmonary embolism has prescribed
aPTT target 60–80 seconds. Current aPTT is 128 seconds, Hgb fell
from 12.4 to 10.1 g/dL, BP is 92/58, HR 112, and the IV site is
bleeding. What should the nurse do first?
- Reduce the infusion slightly and recheck in six hours.
-
Stop the infusion and assess the client for active bleeding.
- Administer vitamin K and continue heparin.
- Document the result as expected.
Check answer and rationale
Correct Answer: B.
Rationale: The client has excessive anticoagulation
with bleeding and instability. Stop the causative infusion,
assess/support ABCs, notify, and prepare protamine under order.
Vitamin K is for warfarin. A routine small adjustment is inadequate
in an unstable bleeding client.
Bonus Real-World Floor Guide
BMP & Blood Cultures/Sensitivity
Heartbeat Humor Academy — Come laugh, learn, heal, repeat.
Basic Metabolic Panel — BMP
In simple NCLEX language, a BMP is the basic chemistry portion of a
CMP
without the liver enzymes, bilirubin, albumin, and total
protein. It contains glucose, calcium, sodium, potassium, chloride,
CO₂/bicarbonate, BUN, and creatinine.
Four Most-Tested BMP Values
| Test |
Normal |
The Nursing Shift |
Pharma Safety Connection |
| BUN |
10–20 mg/dL; some labs 6–20 |
High: dehydration, renal perfusion/function, GI bleed,
catabolism. Low: liver dysfunction, malnutrition, overhydration.
|
Trend with creatinine/eGFR, urine output, BP, and hydration.
Review diuretics, ACEI/ARBs, NSAIDs, lithium/digoxin
accumulation risk. Do not hold on BUN alone.
|
| Creatinine |
0.6–1.2 mg/dL |
High/rising: reduced filtration/AKI/CKD or nephrotoxicity. Low:
often low muscle mass.
|
Use eGFR/CrCl for dosing. Pause/clarify nephrotoxic or renally
cleared drugs with rapid rise, oliguria, or toxicity.
|
| Sodium |
135–145 mEq/L |
High: water deficit and neuro changes. Low: excess water/sodium
loss with headache, confusion, seizure.
|
Diuretics, SSRIs/SNRIs, carbamazepine may lower Na. Sodium/fluid
loss raises lithium toxicity risk. Symptomatic acute abnormality
requires urgent assessment.
|
| Potassium |
3.5–5.0 mEq/L |
High or low can cause weakness and lethal dysrhythmias. |
Hold/clarify potassium-wasting diuretics when K is below the
prescribed parameter; hold/clarify supplements, spironolactone,
ACEI/ARBs when high. Low K raises digoxin toxicity risk. Never
IV-push K.
|
BMP pre-medication check: Is the client making urine?
What is the eGFR? Is K safe for this medication? Is Na affecting
neurological status? Is the abnormality new or baseline? What does the
actual order say?
Blood Cultures & Sensitivity — C&S
Simple Definition
- Culture: “What organism is growing?”
-
Sensitivity/susceptibility: “Which antimicrobial is
likely to work?”
- Susceptible: expected to respond.
-
Intermediate: may respond under specified
exposure/dosing conditions.
- Resistant: not expected to respond.
Golden Rule: Draw ordered blood cultures
before the first antibiotic dose whenever this can be completed
without a dangerous delay. Antibiotics can reduce living organisms in the specimen and produce
a false-negative or less useful result.
Safe Sequence
-
Recognize infection/sepsis and verify culture/antibiotic orders.
-
Collect the ordered sets using strict aseptic technique—commonly at
least two adult sets from separate peripheral sites under facility
policy.
-
Each set usually contains aerobic and anaerobic bottles; obtain the
correct volume.
-
Label at bedside with exact time, site, and method; send promptly.
-
Administer the antibiotic immediately after collection; do not wait
for final results.
-
Monitor allergy/anaphylaxis, kidney/liver function, and response.
-
When results return, administer narrowed/adjusted therapy as
ordered.
Sepsis exception: Cultures first is the ideal
sequence, but sepsis and septic shock are emergencies. Do not create a
substantial delay in life-saving antimicrobials. Collect immediately,
ask for help, and follow the sepsis timeline.
Collection Guardrails
- Use two identifiers and verify allergies/reaction.
-
Disinfect skin and bottle septa per policy; allow antiseptic to dry.
-
Avoid drawing from an existing line unless ordered for possible
catheter infection; clearly label the source.
-
If antibiotics already began, still collect ordered cultures, record
the last dose/time, and do not independently stop therapy.
Cultures Quiz
Culture Before Antibiotic
A client has temperature 102.4°F, HR 118, RR 26, BP 104/64, and new
confusion. The provider simultaneously orders two sets of peripheral
blood cultures and cefepime IV. What should the nurse do first?
- Administer cefepime and collect cultures afterward.
-
Collect both ordered culture sets using aseptic technique, then
promptly administer cefepime.
-
Collect one bottle, give cefepime, and collect the others later.
- Wait for sensitivity results before giving cefepime.
Check answer and rationale
Correct Answer: B.
Rationale: Cultures collected before the first dose
best preserve organism recovery. Both ordered sets should be
collected, followed immediately by empiric antibiotic therapy.
Waiting for final results would dangerously delay sepsis treatment.