Serial HCG Test is used to diagnose the following condition?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Obstetrics & Gynaecology

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Explanation

Choriocarcinoma is a malignant form of gestational trophoblastic neoplasia (GTN) that arises from trophoblastic cells (placental tissue).
These malignant trophoblastic cells secrete high levels of human chorionic gonadotropin (hCG), making it a highly specific and sensitive tumor marker for this condition.
Serial measurement of hCG levels is the standard method for diagnosing choriocarcinoma after a pregnancy event (molar, term, or abortion) and for monitoring the patient's response to chemotherapy and detecting any recurrence.
A plateau or rise in hCG levels after evacuation of a molar pregnancy is a key diagnostic criterion for GTN, including choriocarcinoma.

Option A: Cervical cancer (Ca cervix) is primarily diagnosed through a Pap smear, followed by colposcopy and a cervical biopsy for histologic confirmation. While some advanced cervical cancers might produce tumor markers like SCC antigen, hCG is not the primary diagnostic marker.
Option B: Vaginal cancer (Ca vagina) is diagnosed by a direct biopsy of a suspicious lesion found during a pelvic examination. There are no specific, reliable serum tumor markers used for the routine diagnosis of vaginal cancer.
Option C: Endometrial cancer (Ca endometrium) is diagnosed via endometrial biopsy or a dilation and curettage (D&C), often prompted by abnormal uterine bleeding and thickened endometrium on ultrasound. While CA-125 may be elevated, it is non-specific and not used for primary diagnosis. hCG is not a marker for this cancer.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Tumor markers in gynecological cancers as background academic context rather than a clinical decision trigger.
A nurse's primary role in managing a patient with suspected or diagnosed choriocarcinoma is patient education and support.
It is critical to emphasize the necessity of strict adherence to the follow-up schedule for serial hCG blood tests. Missing appointments can delay the detection of persistent or recurrent disease.
The nurse must counsel the patient on the importance of using highly effective contraception (like oral contraceptives) for the entire surveillance period (often 6-12 months) to prevent a new pregnancy, as this would interfere with hCG monitoring.

How to Approach the Question

First, identify the key term in the question: 'Serial HCG Test'.
Recall the function of hCG. It is known as the 'pregnancy hormone' and is produced by trophoblastic tissue of the placenta.
Consider the options provided. All are gynecological cancers.
Connect the hormone (hCG) to its tissue of origin. A cancer arising from placental or trophoblastic tissue would be the most likely to produce hCG.
Choriocarcinoma is a cancer of the trophoblastic cells. Therefore, it is the condition most logically diagnosed and monitored using serial hCG levels.
Eliminate the other options: Cervical, vaginal, and endometrial cancers arise from different cell types (squamous, glandular epithelium) that do not typically produce hCG.

Concept Tested & Keywords

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E6 Gynecology Williams pp. 367-433, 232-279, 351-421