Guide to Diagnostic Tests
Calcium, serum or plasma
Test/Range/Collection
Calcium, serum or plasma (Ca2+)
8.5–10.5 mg/dL
[2.1–2.6 mmol/L]
Panic: <6.5 or >13.5 mg/dL
SST, PPT (light green)
$
Prolonged venous stasis during collection causes false increase in serum calcium.
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Citation
Nicoll, Diana, et al. "Calcium, Serum or Plasma." Guide to Diagnostic Tests, 7th ed., McGraw-Hill Education, 2017. Emergency Central, emergency.unboundmedicine.com/emergency/view/GDT/619090/all/Calcium__serum_or_plasma.
Nicoll DD, Lu CMC, McPhee SJS. Calcium, serum or plasma. Guide to Diagnostic Tests. McGraw-Hill Education; 2017. https://emergency.unboundmedicine.com/emergency/view/GDT/619090/all/Calcium__serum_or_plasma. Accessed July 17, 2025.
Nicoll, D., Lu, C. M., & McPhee, S. J. (2017). Calcium, serum or plasma. In Guide to Diagnostic Tests (7th ed.). McGraw-Hill Education. https://emergency.unboundmedicine.com/emergency/view/GDT/619090/all/Calcium__serum_or_plasma
Nicoll DD, Lu CMC, McPhee SJS. Calcium, Serum or Plasma [Internet]. In: Guide to Diagnostic Tests. McGraw-Hill Education; 2017. [cited 2025 July 17]. Available from: https://emergency.unboundmedicine.com/emergency/view/GDT/619090/all/Calcium__serum_or_plasma.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC
T1 - Calcium, serum or plasma
ID - 619090
A1 - Lu,Chuanyi Mark,
AU - Nicoll,Diana,
AU - McPhee,Stephen J,
BT - Guide to Diagnostic Tests
UR - https://emergency.unboundmedicine.com/emergency/view/GDT/619090/all/Calcium__serum_or_plasma
PB - McGraw-Hill Education
ET - 7
DB - Emergency Central
DP - Unbound Medicine
ER -
