Calcium

ChemistryAlso known as: CaAlso known as: Serum calciumAlso known as: Total calciummg/dl

Measures calcium concentration in body fluid (serum or plasma, joint fluid, etc.).

Normal Range
2.15 – 2.55 mmol/L
mmol/L
Abnormal Levels
< 8.4 mg/dl
> 10.6 mg/dl
Specimen Type
Blood

Why This Biomarker Matters

Abnormal calcium in body fluids may indicate infection, inflammation, metabolic disease, or organ dysfunction. Results help diagnose serious conditions affecting specific body areas.

Understanding Your Results

Normal Range

2.15 – 2.55 mmol/L

Optimal Ranges

Clinician-defined 4-point reference thresholds (mg/dl)

Default Range

8.4
9
10
10.6
Low
8.4 mg/dl
Borderline Low
9 mg/dl
Optimal
10 mg/dl
Borderline High
10.6 mg/dl

Overview

Calcium is an essential mineral critical for bone health, muscle function, nerve signaling, and blood clotting. This test measures calcium levels in serum or plasma, reflecting overall calcium balance in the body. About 99% of calcium is stored in bones, while the remaining 1% circulates in the blood and is tightly regulated. Abnormal serum calcium may indicate parathyroid disorders, vitamin D deficiency, kidney disease, or certain malignancies. Both hypocalcemia (low calcium) and hypercalcemia (high calcium) can cause serious symptoms including muscle cramps, cardiac arrhythmias, and neurological changes.

Related Health Conditions

Conditions where Calcium is commonly tested

Dental caries

Mild cognitive disorder

Osteopenia

Osteoporosis

Related Health Goals

Enhance Cognitive Function

Promote Healthy Aging

Strengthen Bone Health

Support Oral Health

Treatments & Interventions

Therapies monitored using Calcium

Sodium fluoride

Vitamin D>3<

Fluorine

Silver

Aluminum chloride hexahydrate

Ethylestrenol

Sodium fluoride (18-F)

Aluminium chloride

Medium chain triglycerides

Silver and/or silver compound

Silver and/or silver compound-containing product

Aluminum chloride anhydrous

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

17861-6Primary
Calcium [Mass/volume] in Serum or Plasma
mg/dL
18488-7
Calcium [Mass/volume] in 24 hour Urine
mg/L
49765-1
Calcium [Mass/volume] in Blood
mg/dL
17862-4
Calcium [Mass/volume] in Urine
mg/dL
35675-8
Calcium [Mass/volume] in Urine collected for unspecified duration
mg/L
12181-4
Calcium [Moles/volume] in Body fluid
mmol/L
18186-7
Calcium [Mass/time] in 12 hour Urine
mg/(12.h)
27182-5
Calcium [Presence] in Blood
12511-2
Calcium [Mass/volume] in 4 hour Urine
mg/dL
30527-6
Calcium [Mass/volume] in Total parental nutrition
mg/dL
16518-3
Calcium [Mass/time] in 2 hour Urine
mg/(2.h)
14637-3
Calcium [Moles/time] in 24 hour Urine
mmol/(24.h)
1996-8
Calcium [Moles/volume] in Blood
mmol/L
16273-5
Calcium [Mass/mass] in Red Blood Cells
mg/g{Hb}
29276-3
Calcium [Presence] in Urine
25362-5
Calcium [Moles/volume] in 24 hour Urine
mmol/L
2004-0
Calcium [Moles/volume] in Urine
mmol/L
71790-0
Calcium [Moles/volume] in Urine collected for unspecified duration
mmol/L
32305-5
Calcium [Moles/volume] in Specimen
mmol/L
15155-5
Calcium [Mass/volume] in Body fluid
mg/dL
6874-2
Calcium [Mass/time] in 24 hour Urine
mg/(24.h)
38250-7
Calcium [Mass/volume] in Specimen
mg/dL
2000-8
Calcium [Moles/volume] in Serum or Plasma
mmol/L
53100-4
Calcium [Moles/volume] in Total parental nutrition
mmol/L
53124-4
Calcium [Moles/time] in 1 hour Urine
mmol/h
53455-2
Calcium [Mass/mass] in Specimen
mg/g
53502-1
Calcium [Moles/mass] in Specimen
mmol/g
54364-5
Calcium [Moles/volume] in Nonbiological fluid
mmol/L
54365-2
Calcium [Moles/volume] in Cord blood
mmol/L
57334-5
Calcium [Mass/volume] in 2 hour Urine
mg/dL
57335-2
Calcium [Mass/volume] in 12 hour Urine
mg/dL
57919-3
Calcium [Mass/volume] in Nonbiological fluid
mg/dL
58781-6
Calcium [Mass/volume] in Peritoneal dialysis fluid
mg/dL
59000-0
Calcium [Mass/time] in 18 hour Urine
mg/(18.h)
69425-7
Calcium [Mass/volume] in Semen
mg/dL
74516-6
Calcium [Moles/volume] in Saliva (oral fluid)
mmol/L
87477-6
Calcium in Specimen
%
94255-7
Calcium [Mass/volume] in Sweat
mg/dL
9467-2
Calcium [Mass/volume] in Water
[ppm]
104654-9
Calcium [Moles/volume] in Arterial blood
mmol/L
94839-8
Calcium [Mass/volume] in Urine from Fetus
mg/dL
14415-4
Calcium [Moles/volume] in Amniotic fluid
mmol/L
14416-2
Calcium [Moles/volume] in Pleural fluid
mmol/L
14417-0
Calcium [Moles/volume] in Peritoneal fluid
mmol/L
14418-8
Calcium [Moles/volume] in Synovial fluid
mmol/L
14419-6
Calcium [Moles/volume] in Gastric fluid
mmol/L
14636-5
Calcium [Presence] in Stone
1997-6
Calcium [Moles/volume] in Cerebral spinal fluid
mmol/L
1998-4
Calcium [Moles/volume] in Dialysis fluid
mmol/L
1999-2
Calcium [Moles/volume] in Semen
mmol/L
2001-6
Calcium [Moles/volume] in 24 hour Stool
mmol/L
2002-4
Calcium [Moles/volume] in Stool
mmol/L
25583-6
Calcium [Moles/volume] in Red Blood Cells
mmol/L
27091-8
Calcium [Mass/time] in 4 hour Urine
mg/(24.h)
27172-6
Calcium [Mass/mass] in 24 hour Stool
mg/kg
27373-0
Calcium [Mass/volume] in Dialysis fluid
mg/dL
32541-5
Calcium [Molar amount] in Urine collected for unspecified duration
mmol
42593-4
Calcium [Moles/volume] in Capillary blood
mmol/L
42857-3
Calcium [Moles/volume] in Venous blood
mmol/L
49005-2
Calcium [Moles/volume] in Peritoneal dialysis fluid
mmol/L
49764-4
Calcium [Mass/volume] in Amniotic fluid
mg/dL
50836-6
Calcium [Moles/mass] in Hair
umol/g
51610-4
Calcium [Moles/time] in 12 hour Urine
mmol/(12.h)

Available Lab Tests

Order tests that measure this biomarker

Adrenal Complete

$340.56

Advanced Cardiovascular Health Basic

$132.55

Advanced Cardiovascular Health Comprehensive

$526.57

Advanced Liver Health Basic

$293.92

Advanced Liver Health Comprehensive

$1044.34

Calcium

$8.86
Results in Same day to 1 business day

Calcium Micronutrient Test

$8.80

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$71.57

Comprehensive Metabolic Panel (CMP)

$15.79
Results in Same day to 1 business day

Find Specialists

Doctors who commonly order this test

Dentist
Endocrinology, Diabetes & Metabolism
Rheumatology
Neurology
Psychiatry