IgM

If the results of this blood test, which is called the IgM anti-HAV antibody test, are positive, you definitely have HAV infection.

DR. SANJIV CHOPRA’S LIVER BOOK Sanjiv Chopra 2001

If your disease is acute, a test called IgM anti-HBc also called the IgM core antibody will be positive.

DR. SANJIV CHOPRA’S LIVER BOOK Sanjiv Chopra 2001

Dr. Pirofski and her colleagues counted the number of immune cells known as IgM memory B cells in the bloodstream of three groups of individuals: people infected with HIV who had a history of fungal meningitis caused by Cryptococcus neoformans; people infected with HIV but with no history of the disease; and those with no history of either HIV infection or the disease.

Science Blog - Science news straight from the source 2009

This antibody (referred to as IgM) appears relatively quickly (at day 4) and soon begins to decrease in amount.

CattleNetwork 2008

Sometimes two types of Western blot are performed, "IgM" and

Citizendium, the Citizens' Compendium - Recent changes [en] 2010

The doctor will check to see if your child has the IgM antibody to hepatitis A (anti-HAV) positive, or will try to figure out if your child had contact with someone who has a confirmed diagnosis of hepatitis A virus infection.

Hepatitis A 2010

If a person has an acute infection blood work will show a positive test for hepatitis B virus (HBsAg), HBc-IgM DNA and possibly the HBe-antigen.

Hepatitis B 2010

The Immunology Lab offers both IgG and IgM anticardiolipin antibodies (ELISA) and IgG and IgMbeta-2 glycoprotein antibodies (ELISA).

Immunology Lab 2010

These include immunoglobulin quantitation (IgG, IgG subclasses, IgA, IgM, and IgE) and measurement of functional antibodies against Tetanus and Diphtheria.

Immunology Lab 2010

The first test you need if you have an outbreak is the IgM Herpes Simplex Virus (HSV) Types 1 and 2 test.

Dr. Andrew Lange: How to Get a Sexually Transmitted Disease Without Having Sex 2010