Diagnosis of Autism Spectrum Disorder
Early diagnosis and intervention are key factors associated with a better prognosis. In the majority of Western countries, the average age of diagnosis of ASD is above four years, although it can be diagnosed before the age of two.
There are currently no medical tests available for the diagnosis of autism. Specially trained doctors and psychologists therefore identify autism based on specific behaviours.
Parents are usually the first to realise their child has some strange habits, such as almost never looking into their eyes (eye contact avoidance), not responding to their name or playing with toys in a repetitive or unusual manner.
Both the detection of some strange behaviours in a child and a comparison of the skills they have acquired with respect to their siblings or other children around them can represent warning signs. So the child may be quieter or more passive than others, utter very few words, perhaps they do not babble or use gestures to communicate, do not respond to their name or hardly ever smile or express pleasure when their parents try to share activities with them.
The presence of a warning sign does not necessarily mean the child has a developmental problem. However, it does indicate the need for a more thorough assessment. It is therefore important to discuss any concerns with a paediatrician so they may perform the necessary tests to identify the causes of any warning signs; these causes could include hearing problems or delays in language development, amongst others.
Warning signs in children
Although not all children develop their skills at the same time, there are some typical age periods in which they acquire certain abilities.
- Never having produced a large smile or other expressions of happiness and warmth at the age of 6 months or more.
- Does not reciprocally exchange (gives and receives) sounds, smiles or other facial expressions at the age of 9 months.
- Does not babble at 12 months.
- Does not produce gestures of exchange, e.g., pointing, showing, stretching or waving at 12 months.
- Does not produce words at 16 months.
- Does not produce phrases with two significant words (excluding imitation or repetition) at 24 months.
- Any loss of speech, babbling or social skills at any age.
The main objective is to confirm or rule out the presence of a problem and obtain an accurate diagnosis as early as possible in order to plan the most suitable intervention for each child and their family.
Upon identifying the risk of a communication and social development problem, the paediatrician will refer the family to a specialist for a more comprehensive assessment. Each catchment area has their own specialised care centres where a multidisciplinary medical team will evaluate different aspects of the child’s condition.
Tests of Autism Spectrum Disorder
Questionnaires. Questionnaires adapted to different developmental ages are available to help identify any warning signs.
M-CHAT (Modified Checklist for Autism in Toddlers). This questionnaire can help decide whether children aged between 18 and 24 months have any developmental impairments that need to be assessed. http://mchatscreen.com/wp-content/uploads/2015/05/M-CHAT-R_F_Spanish_Spain.pdf
Observation of behaviour and psychological assessment. Diagnosis is based on observations of the individual’s behaviour and includes a psychological assessment of their language, communication and social skills as well as their cognitive development. This is done using specific diagnostic procedures, such as questionnaires, interviews, tests designed to observe the individual's behaviour and other area-specific tests.
Complementary tests. The medical team may also request some complimentary diagnostic tests, e.g., blood analyses, neuroimaging tests, audiograms or auditory brainstem response tests, which are used to rule out certain metabolic or neurological disorders, or hearing impairments. However, these tests alone can never provide a definitive diagnosis.
Research into personal and family medical background and genetic study. These provide very valuable information for the diagnosis.
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