Does the blood test for rubella virus require fasting?

Written by Xiong Hong Hai
Infectious Disease
Updated on September 12, 2024
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During the examination for rubella, blood can be drawn to test for rubella virus-specific antibodies IgG and IgM. It is best to conduct these tests on an empty stomach as fasting results are more accurate. Additionally, rubella virus can be isolated from some of the nasal secretions of the patient, though this test is more expensive and less commonly used. Rubella is a self-limiting disease; if IgM is found positive through rubella antibody testing, rubella can be confirmed and symptomatic treatment should be administered. There is no specific antiviral medication for the rubella virus.

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Written by Xiong Hong Hai
Infectious Disease
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"Rubella virus positive" means what?

Rubella virus positive, in fact, most cases are diagnosed through blood tests for rubella virus IgG antibodies or IgM antibodies. It depends on which specific indicator is tested. If the IgM antibody is positive and the IgG antibody is negative, it indicates an ongoing infection. If both IgG and IgM antibodies are positive, it can be diagnosed as a rubella virus infection. If the IgG antibody is positive and the IgM antibody is negative, it indicates a past infection with no current rubella virus infection. If the rubella virus is cultured or detected in nasal secretions or blood, a definitive diagnosis can be made.

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Written by Du Rui Xia
Obstetrics
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The impact of rubella virus on the fetus

During pregnancy, if the pregnant woman is infected with the rubella virus, the impact on the pregnant woman herself is not significant; however, it primarily causes severe effects on the fetus. The main impact on the fetus is congenital damage, primarily involving congenital developmental abnormalities, with the early stages of pregnancy being the most critical. This period is a crucial phase of fetal development. If infected with the rubella virus, the risk coefficient can be as high as 80%. After intrauterine infection of the fetus, some patients may develop congenital rubella syndrome, primarily involving cardiac defects, cataracts, deafness, and even delayed brain damage after the baby is born.

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Written by Xiong Hong Hai
Infectious Disease
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What should you eat to recover quickly from rubella?

Rubella is a self-limiting disease, and generally, patients do not require treatment and can recover in about two weeks. However, if symptoms are significant and include fever and joint pain, it may be appropriate to consider using some antipyretic and pain-relief medications. Most patients can fully recover in about two weeks without needing hospital treatment, but appropriate isolation measures should be taken. In terms of diet, it is advisable to consume light, easily digestible food and avoid overly spicy and irritating foods. Generally, rest is recommended, and if appetite is poor, it is better to eat small, frequent meals and avoid fatigue.

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Written by Xiong Hong Hai
Infectious Disease
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Does rubella virus affect pregnancy?

A positive rubella virus infection indeed affects pregnancy, as the rubella virus can enter the fetus through the placental barrier, thereby easily leading to stillbirth, miscarriage, and fetal deformities. Therefore, if women of childbearing age are infected with the rubella virus, they should not get pregnant at this time. It is safer to wait until the condition has fully improved before attempting to conceive. In the early stages of pregnancy, if infected with the rubella virus, a decision on whether to continue the pregnancy should be made under the comprehensive assessment of an infectious disease specialist and an obstetrician/gynecologist, taking into account the actual situation for appropriate treatment and management.

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Written by Xiong Hong Hai
Infectious Disease
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Does rubella virus require treatment?

Rubella virus generally does not have specific antiviral drugs, and treatment is mainly symptomatic. Most cases of rubella are relatively mild and many do not require treatment; full recovery usually occurs within about two weeks. For those presenting with noticeable fever and joint pain, symptomatic treatment can be provided, such as choosing some antipyretics or pain relievers. Generally, patients do not need hospital treatment. After recovery from the illness, relapse generally does not occur and one may acquire some immunity. Most patients do not have any sequelae, but pregnant women may face the risk of miscarriage or fetal malformation.