Getting Your Health Checked Ahead of the Winter Season in London – Vitamin D, Thyroid, Mineral and Immunity Testing Explained
Reviewed by Dr Lauren Holland • Marylebone Diagnostic Centre
Results within 24 – 42 hours. Westminster residents receive 20% off.
Winter often brings tiredness, low mood, weaker immunity and a rise in small infections. Many Londoners assume these changes are normal, yet they are frequently linked to low vitamin D, thyroid imbalance, and subtle mineral deficiencies that develop as daylight reduces and routines change. Clinically, we see these shifts every year as the weather cools and people spend more time indoors.
This guide explains why winter health checks matter, which tests provide the clearest picture of your wellbeing, and how a private blood test in central London can help you stay ahead of winter fatigue, low immunity, and seasonal changes.
How Winter Affects Your Health
Reduced Sunlight and Vitamin D Levels
Vitamin D drops naturally as daylight shortens. London’s low winter sun means the skin produces very little vitamin D between October and March. This can affect:
- Mood
- Energy
- Immunity
- Bone health
- Muscle strength
Low vitamin D is one of the most common findings we see from November onward.
Seasonal Low Energy and Thyroid Function
Some patients report feeling slower, colder, or more tired in winter. These symptoms may overlap with mild thyroid imbalance, especially if you already have borderline readings.
Typical symptoms of thyroid underactivity include:
- Low energy
- Feeling cold
- Dry skin
- Low mood
- Weight changes
A thyroid test helps clarify whether symptoms are simply seasonal or require further attention.
Mineral Deficiencies and Weakened Immunity
Magnesium, zinc, iron, and B vitamins influence energy and immune function. Poor diet, long work hours, and reduced exercise can cause these levels to fall.
Mineral deficiencies may lead to:
- Recurrent infections
- Tiredness
- Muscle aches
- Poor concentration
A simple blood test provides clarity.
Why Londoners Should Consider a Winter Health Check
A winter health screen is useful for anyone who:
- Feels tired as the days shorten
- Works indoors or long office hours
- Has low mood in winter
- Often gets colds or infections
- Exercises less as the weather cools
- Has a family history of thyroid or vitamin issues
- Wants to optimise wellbeing before December and January
Clinically, we notice that early testing prevents months of guesswork and helps people prepare for the colder months with confidence.
The Key Winter Health Tests Offered at Marylebone Diagnostic Centre
Vitamin D Blood Test
This is the most valuable winter test for Londoners. It checks your exact vitamin D level so you can take the right steps to improve immunity, mood, and bone health.
Thyroid Function Test (TSH + FT4)
Checks the two core thyroid markers that regulate energy, metabolism, and heat regulation.
Mineral and Nutrient Testing
We offer several options depending on your needs:
- Mineral profile
- Hair Mineral Analysis for long-term nutrient patterns
- Wellness Profile for broad nutritional and metabolic insights
General Health Profile
A comprehensive check that includes blood count, liver markers, kidney markers, and key nutrients.
How Private Testing Helps During Winter
Preparing Your Body for Winter – Practical Steps
Check your vitamin D early
Testing in October or November helps identify low levels before symptoms become noticeable.
Review your thyroid if you feel unusually cold or tired
Thyroid imbalance is common and often feels worse in winter months.
Monitor minerals for immunity
Zinc, magnesium, and iron play vital roles in fighting infection.
Consider a general health profile once a year
This supports long-term wellbeing and helps catch early issues before they affect winter routines.
Clinical Notes from MDC
Each winter, we see a sharp rise in patients who assumed their tiredness or low mood were seasonal. Their blood tests often reveal low vitamin D, borderline thyroid levels, or mineral deficiencies. Testing early helps prevent winter fatigue, improves productivity, and supports stronger immunity through the colder months. This is especially important for people who travel less, exercise less, or work primarily indoors.
FAQs
Booking Your Winter Health Check at Marylebone Diagnostic Centre
Marylebone Diagnostic Centre
73 Baker Street, London W1U 6RD
Tel: +44 7495 970109
Open Monday–Saturday, 08:00–16:00
Fast, private, and confidential testing with results in 24 – 42 hours.
Westminster residents receive 20% off all tests.
Quick Links
- General Health Profile
- Iron Studies / Iron Profile
- Fatigue and Energy Profile
- Advanced Wellness Profile
- Vitamin B12 Test
- Vitamin D Test
- Full Blood Count
- Thyroid Function Test
- Book an Appointment
