Rapid Urine E2-5 Estradiol Testing Kit

A professional-grade qualitative screening tool designed to indicate whether urinary estradiol levels are above or below a defined 5 ng/mL threshold at the time of testing. This lateral flow assay delivers rapid, easy-to-interpret results using a simple visual readout.

A positive result indicates estradiol levels are above the 5 ng/mL cutoff. A negative result, where both the test (T) and control (C) lines are visible, indicates estradiol levels are below this threshold at the time of sampling.

Intended Use and Clinical Context

Estradiol is a dynamic hormone that fluctuates significantly due to menstrual cycle phase, age, health status, and hormonal interventions. As such, this test is not designed to provide an absolute measurement of estrogen status, but rather a threshold-based snapshot of hormonal activity.

This makes the kit most useful as a screening and trend-monitoring tool, particularly when interpreted over multiple time points rather than as a single isolated result.

What This Test Is Useful For

Monitoring relative hormonal trends

When used repeatedly over time, the test can help indicate whether estradiol levels are remaining consistently below the threshold, increasing toward or above the cutoff, or fluctuating in line with expected physiological cycles. This is particularly relevant in cycle tracking contexts where estrogen rise is expected during follicular development.

Identifying clearly low-estrogen patterns

Consistently negative results across multiple samples may be compatible with low estrogen states, such as postmenopausal physiology, hypogonadal or suppressed ovarian function, or hormonal suppression therapies. Interpretation should always consider clinical context, as this test does not quantify degree of deficiency.

Supporting hormone intervention monitoring

For individuals undergoing hormonal changes or interventions, serial testing may provide a simple way to observe whether estradiol is crossing a defined biological threshold over time.

Rapid preliminary screening

The kit can be used as an initial screening step prior to more detailed laboratory evaluation, offering a quick indication of whether estradiol is above a minimal functional cutoff.

Important Limitations

This is a qualitative test, not a quantitative measurement of estradiol concentration. A single result does not define hormonal health status. Results vary naturally with menstrual cycle timing and physiological conditions. It should not be used to diagnose estrogen deficiency or excess. Confirmatory serum-based testing is recommended for clinical assessment.

Accuracy

A side by side comparison was conducted using the Estradiol (E2) rapid test (urine) and CLIA. The following results were found; 

• Sensitivity: 92.0%
• Specificity: 98.7%
• Accuracy: 98.0%