Symptoms of low testosterone are often non-specific and easy to overlook. However, if you’re experiencing any of the following, it might be time to consider a blood test:²

• Low sex drive

• Fatigue or reduced energy

• Loss of muscle mass or strength

• Mood changes or irritability

• Difficulty concentrating or brain fog

Anaemia is surprisingly common in men, particularly with age — yet it often goes undiagnosed. Research shows that many men with markers like low MCV aren’t followed up properly. If you’re experiencing any of the symptoms below, it could be time for a blood test:⁷

• Constant tiredness, even after rest

• Breathlessness when active

• Difficulty focusing or thinking clearly

• Feeling dizzy or light-headed

• Pale skin or unusually cold hands and feet

Something as simple as feeling unusually thirsty or needing to pee more at night could signal early kidney issues. Chronic kidney disease (CKD) often develops silently, with symptoms only appearing as damage progresses. If you’re experiencing any of the signs below, it could be worth booking a blood test:⁸

• Persistent tiredness or low energy

• Swollen ankles, feet, or hands

• Needing to pee more often, especially at night

• Shortness of breath

• Loss of appetite or unintentional weight loss

Liver conditions can develop silently, showing few clear signs in the early stages. That’s why many people only find out there’s an issue when routine blood tests flag something unusual. If you’re experiencing any of the following, it may be time to book a liver function test:⁹

• Fatigue or constant low energy

• Loss of appetite or unexplained weight loss

• Nausea or stomach discomfort

• Yellowing of the skin or eyes (jaundice)

• Swelling in your legs, ankles, or abdomen

Heart disease doesn’t always come with chest pain. In fact, some of the earliest signs are easy to dismiss, like breathlessness or feeling tired after light activity. A simple blood test is often the first step in spotting potential heart issues. If you’re experiencing any of the following, it might be time to check in on your heart health:¹⁰

• Breathlessness during mild activity or at rest

• Persistent fatigue or low energy

• Swelling in the ankles, feet, or legs

• A fast or irregular heartbeat

• Chest discomfort or tightness not linked to exertion

A venous blood test is taken from a vein by a healthcare professional and allows for a wider range of tests with greater accuracy. A capillary test is done via finger-prick and is convenient for at-home use but isn’t suitable for all markers.

Preparation typically includes fasting for 8-12 hours before the test and avoiding strenuous exercise the day before. The test needs to be taken between 7-11am. Speak to our clinicians if you have any concerns.

Two blood tests are required to ensure an accurate diagnosis of low testosterone. The initial test provides a preliminary assessment. Since testosterone levels can naturally fluctuate due to various factors, a second blood test confirms these results. This two-step process minimises the risk of false positives and provides a solid basis for any necessary treatment.

You should receive your blood test results three to five working days after you take your blood sample.

You’ll get an email notifying you when your results are ready. The best way to view them is via the Numan app where you’ll get a simple breakdown of your results, with any biomarkers outside of the normal range clearly highlighted.

Additionally, you’ll receive a written review of your results from one of our clinicians. This will include tailored advice that helps you navigate your next steps and optimise your levels.

You can view your results at any time and save them as a PDF to help you keep track (and show them to your GP if need be).

Venous blood tests provide a larger and more stable sample, reducing the risk of cell damage and contamination that can occur with finger-prick samples. This makes them more reliable for complex testing.

Yes, but it’s important to disclose any medications or health conditions when ordering your test. Some markers can be influenced by treatment, and our clinicians will take that into account when interpreting your results.

For preventive health, a comprehensive blood test once a year is a good rule of thumb, especially if you’re over 30, managing a health condition, or noticing symptoms like fatigue or mood changes.