LAB VALUE MEMORY TRICKS
RN-NURSE • NCLEX High-Yield Review
COAGS & COMPLETE BLOOD COUNT
aPTT: 30–40 sec
Proper Teaching Time = 30–40
Proper Teaching Time = 30–40
PTT: 25–35 sec
Looks like an “H” → Heparin
Looks like an “H” → Heparin
INR (Warfarin): 2–3
“ON” = 2 letters
“WAR” = 3 letters
“ON” = 2 letters
“WAR” = 3 letters
PT: 10–13 sec
Pre-Teen = 10–13
Pre-Teen = 10–13
WBC: 4,000–11,000
Below 4 → Immunosuppression
Below 4 → Immunosuppression
RBC: 4.5–5.5
“Tissues alive”
“Tissues alive”
Platelets: 150,000–450,000
Hemoglobin:
Male 13–18
Female 12–16
Male 13–18
Female 12–16
Hematocrit:
Male 42–52%
Female 37–47%
Male 42–52%
Female 37–47%
- aPTT and PTT are used to monitor Heparin.
- INR monitors Warfarin therapy.
- Platelets are critical for clotting (bleeding risk if low).
- Low WBC = risk for infection.
- Hemoglobin & Hematocrit reflect oxygen-carrying capacity.
Lab Values QCM
1. Which lab monitors Warfarin therapy?
2. Normal platelet range is:
3. WBC below 4,000 indicates:
