Heavy Periods in SA: When to Test for Iron Loss

You feel exhausted well before the end of the day. You’re cold when everyone else is fine. You go through a pad or tampon every hour for several hours in a row. If this sounds familiar, your period may be doing more than inconveniencing you — it may be systematically draining your iron stores, and a basic haemoglobin check alone will not catch it in time.

Heavy menstrual bleeding (HMB) is one of the most common gynaecological conditions in South Africa, yet it remains stubbornly under-investigated. Understanding the line between a heavy flow and a medically significant one — and knowing exactly which blood tests to request — can stop months or years of preventable iron depletion.

What “heavy” actually means clinically

Clinicians define HMB as blood loss exceeding 80 ml per cycle. To put that in perspective, a fully saturated regular pad holds roughly 5 ml of blood; a super pad holds around 10 ml. Losing more than 80 ml means soaking through 8–16 pads or tampons per cycle at full saturation — not just light spotting on a pad.

Because measuring actual volume at home is impractical, gynaecologists use the pictorial blood assessment chart (PBAC), a validated scoring tool where each saturated regular pad scores 1 point and clots larger than 1 cm score 5 points. A PBAC score above 100 per cycle correlates with blood loss over 80 ml. You can download a PBAC chart through the South African Society of Obstetrics and Gynaecology (SASOG) guidelines or ask your doctor to walk you through it.

Passing clots larger than a 50-cent coin, bleeding that lasts more than 7 days, or flooding through clothing or bedding are all clinical red flags, regardless of your PBAC score.

Why chronic blood loss drains iron differently

This is where many women — and some general practitioners — get tripped up. Dietary iron deficiency and HMB-driven iron deficiency follow the same end-point (depleted ferritin, then low haemoglobin) but they deplete your stores at different rates and in different patterns.

Each millilitre of menstrual blood contains roughly 0.5 mg of iron. A woman losing 80 ml per cycle loses at least 40 mg of iron per period. Losing 150–200 ml — which is not uncommon in women with fibroids or adenomyosis — costs 75–100 mg monthly. The daily dietary requirement for menstruating women is only about 8 mg of absorbed iron per day, and absorption from food is rarely more than 10–15% efficient, meaning food alone cannot always keep up with heavy-cycle losses.

The result is a slow, cumulative drain: ferritin (your iron storage protein) falls first, often for months, before haemoglobin drops. A woman can feel fatigued, struggle to concentrate, and have restless legs while her haemoglobin still looks “normal” on a basic blood count. This is iron deficiency without anaemia — and it is extremely common in SA women with HMB.

SA’s anaemia burden complicates the picture

South Africa carries a high background rate of anaemia that makes individual diagnosis messier. The South African Medical Research Council (SAMRC) and the 2016 South African Demographic and Health Survey both document anaemia in roughly 20% of women of reproductive age nationally, with rates higher in rural areas and among women living with HIV or TB — conditions that independently suppress iron absorption and red blood cell production.

If you have HIV or are on antiretroviral therapy, or if you have a history of TB, chronic anaemia may already be present before HMB begins. This means your baseline ferritin may be low before your period adds to the deficit — and your symptoms may be worse than the numbers suggest.

Importantly, no local data exists on the precise prevalence of HMB-specific iron deficiency as distinct from background anaemia in SA populations. UK NICE guidance estimates that HMB affects 1 in 3 women at some point in their life; local SASOG data acknowledges HMB as a leading reason for gynaecology referral but does not yet publish a national prevalence figure.

Which blood tests to request — and in what order

A routine full blood count (FBC) alone is insufficient if you suspect HMB-driven iron deficiency. Here is the recommended testing sequence, in order of priority:

Serum ferritin — the earliest marker of iron depletion. A result below 30 µg/L indicates iron deficiency even if haemoglobin is normal. Below 15 µg/L is severely depleted. This single test catches deficiency weeks to months before anaemia appears on a standard FBC.

Full blood count (FBC) — checks haemoglobin, red cell size (MCV), and red cell colour (MCH). Low MCV and MCH alongside low haemoglobin suggest iron deficiency anaemia, but normal results do not rule out early depletion.

Serum iron and transferrin saturation — useful when ferritin is borderline or when inflammation may be falsely elevating ferritin (ferritin is an acute-phase protein; infection or chronic illness pushes it up, masking true depletion). Transferrin saturation below 20% alongside low ferritin confirms deficiency.

C-reactive protein (CRP) — ordered alongside ferritin specifically when you have a chronic illness (HIV, TB, inflammatory conditions), because CRP tells the lab whether to interpret your ferritin cautiously.

If the cause of HMB is not obvious, your GP or gynaecologist may also request a pelvic ultrasound to check for fibroids, polyps, or adenomyosis — structural causes that are common and treatable.

What tests cost at public and private facilities

Access to testing and treatment in South Africa

Public sector pathway: Start at your nearest community health centre (CHC) or public clinic. A nurse or doctor can request an FBC at no charge; ferritin is available at most district hospital laboratories and is also free under the National Health Laboratory Service (NHLS) for public patients. If findings suggest HMB, ask for a referral to the gynaecology outpatient department at your district or regional hospital. Waiting times vary, but the referral pathway is free.

Private sector costs: A private general practitioner consultation runs roughly R600–R950 out of pocket. The NHLS ferritin test costs around R180–R250 at a private pathology group (Lancet, Ampath, Pathcare); a full iron panel including ferritin, serum iron, and transferrin saturation typically costs R500–R800. A private pelvic ultrasound adds R800–R1,500 depending on the facility.

Medical aid: Heavy menstrual bleeding qualifies as a gynaecological condition, and iron deficiency anaemia requiring treatment is a Prescribed Minimum Benefit (PMB) under Diagnosis Treatment Pair code 919P. This means your medical aid must cover diagnosis and treatment costs for the acute anaemia itself, though benefit rules on consultations and ultrasounds vary by scheme — confirm with your scheme administrator before booking.

Barriers and workarounds: Load-shedding affects automated laboratory equipment at some public facilities, occasionally delaying results. If you are told results are delayed, ask whether the NHLS hub servicing your clinic has a backup schedule and request a specific callback date. Transport costs to district hospitals are a real barrier in rural provinces; ask your clinic sister whether the fixed clinic day for gynaecology referrals can coincide with your nearest mobile health unit visit.

What happens after diagnosis

If ferritin is confirmed low and HMB is the likely cause, treatment runs on two parallel tracks: replenishing iron stores and addressing the underlying cause of the bleeding.

Oral iron supplementation — typically ferrous sulphate 200 mg twice daily, providing roughly 65 mg of elemental iron per dose — is the standard first step, and it is available free at public clinics. Expect to take it for at least 3 months after ferritin normalises to rebuild storage iron, not just to restore haemoglobin. Taking it with a small glass of rooibos (which, unlike black tea, contains very little tannin and does not significantly inhibit iron absorption) or orange juice improves tolerability for many women. Avoid taking iron within 2 hours of dairy like amasi, which reduces absorption.

For the bleeding itself, options range from hormonal management (combined pill, progestogen-only pill, or the levonorgestrel-releasing intrauterine system) to surgical referral, depending on the underlying cause and your reproductive plans. Your gynaecologist will guide this.

When to see a doctor or go to a clinic

– You are soaking through a pad or tampon every hour for 2 or more consecutive hours

– You are passing clots larger than a 50-cent coin regularly

– You feel faint, short of breath, or have chest pain during your period

– Your fatigue is persistent and not explained by sleep or workload

– You are pregnant or planning pregnancy and have heavy cycles — iron deficiency in pregnancy carries significant foetal risk

– You have HIV, TB, or a chronic inflammatory condition and your periods have become heavier