Question 1

How can I test my cortisol levels?

Accepted Answer

Cortisol can be measured through blood, saliva or urine tests, depending on the type of insight you need. A standard cortisol blood test provides a snapshot of your hormone level at a specific time of day, usually in the morning when cortisol peaks. However, because cortisol naturally fluctuates throughout the day, a saliva or urine test often gives a more complete picture. For a more comprehensive assessment, i-screen offers advanced testing such as the DUTCH test (Australia), which provides a detailed profile of stress and sex hormones to help pinpoint the root cause of your fatigue or mood changes.

Question 2

What blood test checks for thyroid function?

Accepted Answer

A thyroid function test measures three key hormones that regulate your body’s metabolism and energy: - TSH (Thyroid-Stimulating Hormone) — signals the thyroid to produce hormones. - Free T4 (Thyroxine) — represents how much thyroid hormone is available for use. - Free T3 (Triiodothyronine) — the active hormone that influences how your body converts energy. Together, these results help determine whether your thyroid is underactive (hypothyroidism) or overactive (hyperthyroidism). If your results show irregularities, a thyroid antibodies test can detect autoimmune conditions such as Hashimoto’s thyroiditis or Graves’ disease, both of which can impact hormone production long before symptoms become obvious.

Question 3

What is included in an iron studies blood test?

Accepted Answer

An iron studies blood test provides a comprehensive look at how your body stores and uses iron — a key mineral for oxygen transport and energy production. The panel typically includes: - Serum Iron — The amount of circulating iron in your blood. - Ferritin — Reflects your stored iron levels and helps detect early deficiency. - Total Iron-Binding Capacity (TIBC) — Measures your blood’s capacity to bind and carry iron. - Transferrin Saturation — Indicates how efficiently iron is being transported to cells. Low iron can cause persistent tiredness, poor concentration, shortness of breath and dizziness. If you suspect a deficiency, i-screen’s iron studies blood test can help identify whether you need supplementation or further investigation for absorption issues.

Question 4

Do I need to fast for a vitamin D or iron test?

Accepted Answer

Fasting requirements depend on the type of test. You don’t need to fast for a vitamin D blood test, as this nutrient isn’t significantly affected by short-term food intake. However, it’s recommended to fast for 8–12 hours before an iron studies test, since recent meals — particularly those containing iron or supplements — can temporarily raise your levels and affect accuracy. If you’re taking iron or multivitamin supplements, it’s best to avoid them on the morning of your test unless instructed otherwise. Staying hydrated with water is fine but try to skip tea or coffee before testing, as caffeine can interfere with absorption and iron readings.

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How i-screen works

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03Visit a Collection Centre

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01Order online

02Receive pathology request form

03Visit a Collection Centre

04Get your results