IgM

An immunoglobulins blood test measures the amount of immunoglobulins in your blood. Immunoglobulins are also called antibodies. Antibodies are proteins that your immune system makes to fight germs, such as viruses and bacteria. Your body makes different kinds of antibodies to fight germs in different parts of the body and at different stages of an infection.

An immunoglobulins blood test can help your health care provider diagnose different types of health conditions that may affect your immune system.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

20 published ranges, each from a named source

45150 mg/dL drawn: all ages · American Board of Internal Medicine (Laboratory Test Reference Ranges)

18 y+: 37–286 mg/dL
19 y+: 35–263 mg/dL
Normal: 45–150 mg/dL

Ranges from ARUP Laboratories Test Directory, American Board of Internal Medicine (Laboratory Test Reference Ranges), Mayo Clinic Laboratories (Pediatric Test Catalog).

All source ranges (20)

Source	Sex	Age	Range
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	<20 MPL
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	<21 SMU
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	45–150 mg/dL
ARUP Laboratories Test Directory	All	≤ 2 y	21–215 mg/dL
ARUP Laboratories Test Directory	All	3 y – 4 y	26–155 mg/dL
ARUP Laboratories Test Directory	All	5 y – 9 y	26–188 mg/dL
ARUP Laboratories Test Directory	All	10 y – 14 y	47–252 mg/dL
ARUP Laboratories Test Directory	All	15 y – 18 y	26–232 mg/dL
ARUP Laboratories Test Directory	All	19 y+	35–263 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 7 y	37–224 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 5 mo	26–122 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 13 y	41–255 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 10 y	38–251 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 4 y	37–184 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 18 y	49–201 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 1 y	40–143 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 9 mo	32–132 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 2 y	46–152 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	≤ 16 y	45–244 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	18 y+	37–286 mg/dL

What an abnormal result can be associated with

A high result: Increased circulating IgM concentration
A low result: Decreased circulating IgM concentration

Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis: only a clinician can interpret your result in context.

details

Sample: Serum or plasma · LOINC
Part of: Immunoglobulin panel
Listed under: Autoimmune Diseases · Bacterial Infections · Viral Infections
Code: LOINC 2472-9 · MPL
Also known as: Immune globulin M, Immunoglobulin M

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