What Your Military Hearing Grade Means: H1, H2, H3 and H4

The H grade forms part of PULHHEEMS, the Armed Forces profile used to standardise medical functional assessment. Its two H components relate to hearing acuity in the right and left ears, and the grade is based on audiometric thresholds used within the wider military employability system.

The grades, and the sentence that follows them

IMEG says hearing acuity is tested by pure-tone audiometry from 250 Hz to 8 kHz. The grade itself is determined separately for each ear, using the sum of thresholds at two groups of frequencies.

What PULHHEEMS is — and is not

IMEG describes PULHHEEMS as a tool that standardises medical functional assessment. Its letters cover P Physical Capacity, U Upper Limbs, L Locomotion, HH Hearing Acuity (right and left), EE Visual Acuity (right and left), M Mental Capacity and S Stability.

That tells you what the hearing grade is fundamentally for: military function and employability. It was not designed as a personal-injury damages scale.

There are two H positions because the ears are assessed separately — someone can hold different grades in each ear, which matters because military hearing loss is often not symmetrical.

Why 250 Hz and 8 kHz are tested but not graded

Only six frequencies feed the published sums: 500 Hz, 1 kHz and 2 kHz in the low group, and 3 kHz, 4 kHz and 6 kHz in the high group. Hearing is tested more widely than that.

The audiogram and the occupational grading calculation are simply not the same thing. A frequency can be medically useful without appearing in the arithmetic — and 8 kHz is the clearest case. Abbott shows 8 kHz can matter when interpreting a possible NIHL pattern, yet it is not part of the H sum. "Not used in H grading" does not mean "clinically irrelevant".

H1 and H2

H1 is the highest category in the published table: for an ear to fall within it, the low-frequency sum must be no more than 45 dB and the high-frequency sum no more than 45 dB.

H2 allows a greater summed threshold: not more than 84 dB in the low group and 123 dB in the high group. IMEG states that the general minimum service entry standard is H2, and for aircrew, H1. The word *general* matters — different military occupations may have particular requirements, and that sentence should not be rewritten as "every applicant who meets H2 is medically acceptable for every role".

Do not convert an H grade into a clinical severity label. Two people can reach the same grade through very different combinations of thresholds, and an H2 ear might have change concentrated at particular frequencies. Read the underlying audiogram, not the category. And an H2 result could reflect military noise, ageing, another medical condition, or a combination — H2 describes the acuity; it does not identify the cause.

H3 and H4

H3 permits a low-frequency sum of not more than 150 dB and a high-frequency sum of not more than 210 dB. H4 applies above those limits.

IMEG says that where a serving member is H3 or H4, temporary downgrading occurs and specialist otolaryngological and occupational-health opinions are obtained. It then says H3 in one or both ears may make a person not fully deployable — *may*, not *automatically does*. The consequences can depend on occupation, duties, hearing function, specialist assessment and wider medical-employability status.

Because the personal and operational stakes are high, IMEG says objective testing should routinely be used where downgrading to H3 or lower, or medical discharge, is being considered — undertaken and interpreted by suitably experienced experts. A major career decision should not be read off one unexplained screening result.

And H4 still does not identify a cause. IMEG's sequence stands: calculate the grade, separately consider the noise history and audiometric pattern, then consider and exclude other causes before establishing NIHL.

What about H8?

Veterans may also encounter H8. IMEG records that qualities are graded numerically 0–8, that the full range does not apply to all of them, and that the HH options are 1, 2, 3, 4 and 8. Within that scale, grade 8 means medically unfit for service.

Grades change, and what that does and does not prove

IMEG records that a permanent PULHHEEMS profile is awarded at entry, and that subsequent re-gradings can occur in service following a medical board. So a veteran may see different hearing grades at different career stages, and the underlying audiograms explain why.

A move from H1 to H2 shows the classification changed. It does not prove noise damage — causation still needs the pattern of deterioration, noise exposure, age, medical history and other possible causes, which IMEG keeps as separate questions.

IMEG does say that once someone is serving, deterioration in the high frequencies is currently taken as indicative of noise damage, and so of a need for enhanced protection and increased surveillance. That is an occupational-health trigger, not a legal finding — the same passage still requires exposure, audiometric pattern and alternative causes to be considered.

Two people with the same grade can also hear very differently in real life. The grade compresses several thresholds into a category and does not quantify tinnitus, speech-in-noise difficulty, localisation or listening effort. Nor does it show whether a loss is sensorineural, conductive or mixed — routine surveillance audiometry uses air conduction without the bone-conduction information needed to classify it. See hearing loss types.

And because the grade records measured acuity, age-related loss affects it too. It does not distinguish presbycusis from NIHL — which is precisely why IMEG requires other causes to be considered.

H grades are not compensation

This deserves its own section because the numbers look superficially similar. PULHHEEMS H1–H4 is a military medical-employability system. AFCS tariff levels are part of a statutory compensation scheme. The resemblance is coincidental.

The same applies to the War Pension Scheme, which has its own statutory disablement-assessment rules: H2 does not mean 20% disablement. And H1–H4 are categories, not percentages — there is no reading under which H4 means "100% hearing loss". The number after the H identifies the grade, not the proportion of hearing lost.

Civil damages are not calculated by pricing a PULHHEEMS number either. They may require analysis of attributable NIHL, tinnitus, functional disability, treatment, hearing aids, employment consequences and other financial losses — and Abbott did not value its test claimants by reading their military H grades. Our civil claim, AFCS and War Pension guide and compensation guide cover those routes.

A grade can still be useful evidence. A contemporaneous change may help show that hearing acuity changed, roughly when concern arose, whether a downgrade occurred and whether specialist assessment followed. But read it with the underlying audiograms, which contain far more information.

Working from your own paperwork

If your records just say H2 or H3, try to obtain the material behind it: recruitment audiograms, military surveillance audiograms, ENT or audiology assessments, occupational-health records, medical-board records and later civilian audiograms. The grade is a summary; the original thresholds tell a much richer story. Our records guide covers how to request them, and audiograms over time explains how the sequence fits together.

The arithmetic itself is simple. For each ear, add the thresholds at 500 Hz, 1 kHz and 2 kHz; add those at 3 kHz, 4 kHz and 6 kHz; then compare both sums with the table above.

Worked example: an ear with low-frequency thresholds of 10 + 15 + 20 = 45 dB and high-frequency thresholds of 10 + 15 + 20 = 45 dB sits exactly at the H1 maximum. If the high-frequency thresholds later total 100 dB, that exceeds H1 but remains within the H2 high-frequency maximum of 123 dB. The arithmetic explains why the category changed. It does not explain why the hearing changed — that needs the clinical and exposure evidence.

If your records show H3 or H4, do not start with a compensation figure. Start with the evidence behind the grade: which audiogram produced it, what earlier tests showed, whether the loss was symmetrical, whether it was high-frequency, whether specialist audiology or ENT was involved, whether a downgrade was recorded, and what later testing showed.

Common questions