CMPA, CMA, CMPI, MSPI: What the Abbreviations Mean

Milk allergy comes with an alphabet of its own: CMPA, CMA, CMPI, MSPI, IgE, FPIES, eHF, AAF. If a clinic letter, a forum thread and a formula tin all seem to use different words for the same thing, that is because they often do.

So what does CMPA stand for, and are CMA, CMPI and MSPI the same thing? This glossary answers that for each abbreviation.

Key takeaways

• CMPA and CMA are two abbreviations for one condition: an immune reaction to the proteins in cow's milk.^[1]
• CMP usually means "comprehensive metabolic panel", a blood test unrelated to milk;^[3] on allergy pages it can also mean "cow's milk protein".
• CMPI and MSPI are older or informal labels for the same immune reaction.^[2][9][10]
• IgE and non-IgE describe how, and how fast, the immune system reacts: minutes versus hours to days.^[1]
• eHF, AAF and pHF are formula types; which one, if any, is the clinician's decision.^[1][5]
• iMAP and CoMiSS are clinical tools, not diagnoses.^[1][7]

What does CMPA stand for?

CMPA stands for cow's milk protein allergy. The immune system treats the proteins in cow's milk, mainly casein and whey, as a threat and reacts to them. It is mostly a condition of infancy and early childhood, and many children outgrow it.^[1][8]

The word "protein" matters: the reaction is to protein, not to lactose, the sugar in milk, which is the whole difference from lactose intolerance, covered in CMPA vs lactose intolerance in babies.

Studies that confirm the allergy with a supervised food challenge find it in roughly 1% of infants, far below parent-reported rates, which is why guidelines warn about over-diagnosis; the American Academy of Pediatrics cites up to 3%.^[1][2] We look at that gap in why CMPA seems so common now.

CMA: cow's milk allergy

CMA is cow's milk allergy without the word "protein". It is the abbreviation used by ESPGHAN (the European paediatric gastroenterology society), the iMAP guideline and most research papers.^[1][5] CMPA is what you will more often see on NHS hospital leaflets, US children's hospital pages and in parent groups.^[4][10]

Is it the same as CMPA? Yes. Same condition, same diagnosis, same management; the letters are the only difference.

What does CMP mean? Usually a blood test

In medicine, CMP almost always means comprehensive metabolic panel: a routine blood test that measures 14 substances, including glucose, electrolytes and markers of kidney and liver function.^[3]

In allergy leaflets, "CMP" is sometimes shorthand for cow's milk protein, as in "a CMP-free diet". Context tells you which is meant: lab results, the blood test; feeding, milk protein.

Is it the same as CMPA? No. A comprehensive metabolic panel is a blood test, not an allergy test.

CMPI: cow's milk protein intolerance

CMPI stands for cow's milk protein intolerance. It survives on some hospital websites and in older articles, usually describing the same immune reaction as CMPA. The University of Rochester's children's hospital, for example, defines CMPI as "an abnormal response by the body's immune system to a protein found in cow's milk" and notes it can be IgE-mediated or non-IgE-mediated.^[10]

The wording has fallen out of favour because "intolerance" has a specific meaning. The AAP describes food intolerance as a non-immune process, caused by things like enzyme deficiencies, and food allergy as an immune reaction, whether IgE or non-IgE.^[2] Milk protein reactions are immune, so current guidelines call them an allergy.^[1][5]

Is it the same as CMPA? When CMPI means an immune reaction to milk protein, yes. When someone uses it to mean lactose intolerance, no.

MSPI: milk-soy protein intolerance

MSPI stands for milk-soy protein intolerance, an informal, mainly US term for babies who react to both cow's milk protein and soy protein, typically with delayed gut symptoms such as mucus or blood in the stool, diarrhoea, gas, reflux and colic.^[9] It is described as a delayed reaction with no specific test, usually said to resolve within the first few years.^[9]

You will not find MSPI in the ESPGHAN position paper or the iMAP guideline. What they describe is non-IgE-mediated cow's milk allergy, in which some babies also react to soy: ESPGHAN notes milk-soy co-allergy is rare in the IgE type but may be more frequent in the non-IgE type, with mixed study results.^[1][5] That is one reason guidelines put extensively hydrolysed formula, not soy formula, first for most infants.^[1][5]

Is it the same as CMPA? Close. MSPI overlaps with non-IgE CMPA in which soy is also a trigger; the label differs, the need for a clinician to confirm it does not.

IgE-mediated and non-IgE-mediated

IgE-mediated

IgE is an antibody. In IgE-mediated milk allergy, symptoms start quickly, usually within minutes of a feed: hives, swelling of the lips or face, vomiting, wheeze and, in the most severe form, anaphylaxis.^[1] Skin-prick and blood IgE tests can help investigate this type, interpreted by a clinician, because a positive test shows sensitisation rather than proving allergy.^[1]

Non-IgE-mediated

Non-IgE reactions involve other parts of the immune system and are delayed: symptoms usually begin two or more hours after milk, often between 6 and 72 hours later.^[1][4] They are mostly gut and skin symptoms: reflux, loose or bloody stools, constipation, eczema flares, discomfort with feeds.^[4] It is the most common type in infants, and the most often over-called, because the same symptoms are common in healthy babies.^[1][4] Some children have a mix of both.^[1] How each type is confirmed is covered in how CMPA is diagnosed.

Are they the same as CMPA? They are the two types of CMPA. "Non-IgE CMPA" and "delayed CMPA" mean the same thing.

FPIES: food protein-induced enterocolitis syndrome

FPIES is a specific, uncommon type of non-IgE food allergy that mostly affects the gut. In its acute form, a baby starts vomiting repeatedly one to four hours after eating the trigger food, often becoming pale and floppy, sometimes with diarrhoea in the hours that follow.^[6] Cow's milk is one of the most commonly reported triggers, along with soy, and rice and oats among solids.^[1][6] Because it can lead to dehydration and shock, FPIES is treated as a potential medical emergency even though it is not IgE-mediated.^[1][6] Many children outgrow it in early childhood, but the timing varies widely between studies.^[6]

Is it the same as CMPA? Not exactly. When cow's milk is the trigger it sits under the non-IgE umbrella, but FPIES is its own diagnosis with its own criteria and emergency plan.^[6]

When to get emergency help. If your baby has trouble breathing, noisy breathing or a hoarse cry, swelling of the tongue or throat, becomes pale, floppy or unresponsive, or has repeated forceful vomiting after a feed, treat it as an emergency. Use an epinephrine (adrenaline) auto-injector if one has been prescribed, then call 911 in the US, 999 in the UK or your local emergency number, and get your baby seen even if symptoms seem to settle.^[8]

eHF, AAF and pHF: the formula abbreviations

Which of these a baby needs, if any, is a decision for the child's clinician or paediatric dietitian.

eHF: extensively hydrolysed formula

Cow's milk protein broken into very small pieces so the immune system is less likely to recognise it.^[4] Guidelines recommend eHF as the first formula for most formula-fed infants with suspected mild-to-moderate milk allergy.^[1][5] In the US this is the type usually labelled "hypoallergenic".^[2]

AAF: amino acid-based formula

Sometimes called elemental formula. Instead of milk protein it contains amino acids, the building blocks of protein, so there is nothing left for the immune system to recognise.^[4] It is used when a baby keeps reacting on eHF, in severe presentations such as anaphylaxis or severe FPIES, and in some countries as a first choice.^{[1][2][5][10]}

pHF: partially hydrolysed formula

Milk protein broken into larger pieces than in eHF. These are not truly hypoallergenic and are not recommended for treating milk allergy, whatever the front of the tin suggests.^[1][8]

Are they the same as CMPA? No. They are options a clinician may choose for CMPA, not names for the condition. Ingredient lists still matter with any product; our free hidden milk ingredients label checklist shows the names milk hides behind.

iMAP: the Milk Allergy in Primary Care guideline

iMAP stands for international Milk Allergy in Primary Care: a guideline, first written for UK family doctors and adapted internationally in 2017, that sets out pathways for non-IgE milk allergy. These include a supervised two-to-four-week trial without milk, a planned reintroduction to check whether symptoms return, and later a "milk ladder" for gradual home reintroduction in mild-to-moderate cases once tolerance is likely.^[5] We explain reintroduction in do babies outgrow CMPA?.

Is it the same as CMPA? No. iMAP is a set of instructions for clinicians, not a condition.

CoMiSS: Cow's Milk-related Symptom Score

CoMiSS is a short checklist scoring crying, regurgitation, stools, skin and breathing, from 0 to 33. In the 2022 update, 10 or more is suggested as the level at which milk-related symptoms are worth investigating, and 6 or lower makes milk allergy unlikely.^[7] Its authors state that "CoMiSS is an awareness tool and not a diagnostic test", and ESPGHAN adds it is not a screening tool either: a diagnosis still needs a supervised elimination and food challenge.^[1][7]

Is it the same as CMPA? No. A high score is a reason to talk to your clinician, not a result.

Keeping the words straight between appointments

Much of the confusion comes from trying to remember, weeks later, what a clinician said. Write things down as they happen: the term used, what was suggested, what you noticed after each feed. The CMPA Baby app is built for keeping that record between visits, so you can show a timeline rather than reconstruct one. If you are still at the "is this something?" stage, 5 early signs of CMPA describes what parents commonly notice first, and what is CMPA? covers the basics.

Talk to your child's clinician

Abbreviations are shorthand, not diagnoses. Crying, spit-up, eczema and changes in stools are not diagnostic of milk allergy by themselves, and green or mucousy stools in an otherwise well baby are not a sign of it either.^[1] If you think milk may be a problem, take your notes to your paediatrician, GP or paediatric dietitian, ask which term they are using and what it means, and make any change in feeding together with them.