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RH IMMUNE GLOBULIN

Mnemonic

SE RHIG

Synonym

Rhogam® RhIG Workup

Includes

ABO and Rh type of mother, fetal bleed screen and antibody screen of mother.

Guidelines

To prevent Rh-negative individuals from becoming sensitized to D antigen after exposure to Rh-positive red cells through pregnancy or transfusion. Testing is done to determine eligibility and dosing of Rh Immune Globulin. This product is recommended for Rh negative patients, for antepartum use at 26-28 weeks or at any time following termination of pregnancy, abortion, amniocentesis, ectopic pregnancy, significant abdominal trauma. May be indicated in some Rh negative patients receiving Rh positive blood products.

Specimen Collection Requirements

Patient Preparation

Patient should have patient identification wristband for checking against component container label before administration.

Collect

Post-partum blood specimens from both mother and newborn are required for testing. Two full 4.0 mL lavender (EDTA) top tubes, collected post-partum from mother. One lavender top microtainer tube from the newborn.

Handling

Tubes must be labeled appropriately. See Blood Bank Specimen Collection Guidelines.

Preferred Volume

Two full 4.0 mL lavender (EDTA) top tubes

Minimum Volume

Two lavender (EDTA) top microtainer tubes (Whole Blood 1.0 mL minimum draw)

Transport

Ambient or refrigerated

Rejection Criteria

Gross hemolysis, incorrect specimen container, incorrectly labeled or frozen

Stability

Ambient: 24 hours; Refrigerated: 2 days; Frozen: Unacceptable

Testing Information

Note

Product is available directly from Legacy Hospital Pharmacies.

ABO and Rh Type must be ordered and performed on infant.

Performed

7 days/week

Reported

2-24 hours, for routine testing

Method

See specific test

Reference Values

Reference Values

Kleihauer Stain Interpretive Data:

Volume of FMH
   0-14 mL    = 1 dose of RhIG (if indicated)
 15-44 mL    = 2 doses of RhIG (if indicated)
 45-74 mL    = 3 doses of RhIG (if indicated)
 75-104 mL  = 4 doses of RhIG (if indicated)
105-134 mL = 5 doses of RhIG (if indicated)

Comments

RhIG is an immunoglobulin product containing IgG directed against the D antigen.  A normal dose contains 300 µg anti-D; Mini vial 50 µg anti-D.  Dosage:  One ampule per 30 cc fetal blood, calculated from Kleihauer-Betke test.  One mini vial of 50 µg ampule for termination of pregnancy within first 12 weeks.  One dose all other indications.
Limitations:  A single dose is occasionally not adequate.  Failures occur.

Last Updated: Wednesday, March 15, 2017 04:20:57 PM


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