TSH stands for thyrotropin and is a test for thyroid stimulating hormone levels to help diagnose abnormal thyroid function disorders such as hypothyroidism and hyperthyroidism. The TSH value is checked during pregnancy to check for abnormalities in thyroid function such as hyperthyroidism and hypothyroidism during pregnancy. TSH test results need to be combined with other results of thyroid function tests for a comprehensive analysis and appropriate medication should be given as prescribed by the doctor in case of significant thyroid function abnormalities.